CN104959228B - Lean magnetite beneficiation method capable of reducing fineness of grinding ore - Google Patents
Lean magnetite beneficiation method capable of reducing fineness of grinding ore Download PDFInfo
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- CN104959228B CN104959228B CN201510440041.7A CN201510440041A CN104959228B CN 104959228 B CN104959228 B CN 104959228B CN 201510440041 A CN201510440041 A CN 201510440041A CN 104959228 B CN104959228 B CN 104959228B
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- magnetic
- magnetic separation
- concentrate
- ore
- coarse fraction
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000227 grinding Methods 0.000 title claims abstract description 18
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title abstract 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 110
- 229910052742 iron Inorganic materials 0.000 claims abstract description 49
- 238000007885 magnetic separation Methods 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 239000012141 concentrate Substances 0.000 claims description 47
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 24
- 229910052804 chromium Inorganic materials 0.000 claims description 24
- 239000011651 chromium Substances 0.000 claims description 24
- 239000004575 stone Substances 0.000 claims description 16
- 239000006148 magnetic separator Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000011362 coarse particle Substances 0.000 abstract 4
- 238000000926 separation method Methods 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 20
- 239000011707 mineral Substances 0.000 description 20
- 239000000126 substance Substances 0.000 description 9
- 238000010494 dissociation reaction Methods 0.000 description 6
- 230000005593 dissociations Effects 0.000 description 6
- 239000000178 monomer Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000006396 nitration reaction Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052635 ferrosilite Inorganic materials 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a lean magnetite beneficiation method capable of reducing fineness of grinding ore, which comprises the following process steps: (1) finely grinding crushed lean magnetite ore and then carrying out primary coarse particle magnetic separation; (2) classifying primary coarse particle magnetic separation magnetic concentration by adopting a high frequency fine screen; (3) carrying out secondary ore grinding on oversize products and then carrying out secondary coarse particle magnetic separation; (4) returning secondary coarse particle magnetic separation magnetic concentration to the high frequency fine screen in step (2) to be reclassified, and repeating the operations of steps (2) to (6); (5) carrying out fine magnetic separation on high frequency undersize products; (6) carrying out fine separation on fine magnetic separation magnetic concentration by adopting a magnetic separation column so as to obtain iron ore concentration, returning magnetic separation column tailings to the secondary ore grinding procedure in step (3) and repeating the operations of steps (3) and (4). The granularity of -0.074 mm of iron ore concentration separated by the method disclosed by the invention accounts for 35-88%, which is reduced by more than 10% compared with iron ore concentration obtained by a conventional dressing production procedure, iron grade is 65-69%, and iron recovery rate is 45-97%.
Description
Technical field
The invention belongs to technical field of mineral processing is and in particular to a kind of chromium depleted zone ore dressing that can reduce mog
Method.
Background technology
Iron mine be find in numerous mineral resources earliest, using resource the widest and that consumption is maximum, be also China the most
One of important strategic resources.Being mainly characterized by of China's iron ore: (1) reserves are big, but are nearly all lean ores, average ferrum product
Position 32%, needs ore dressing to process；(2) iron mine species are many, such as magnetic iron ore, bloodstone, limonite, siderite, ferrosilite etc., I
The iron ore of state 97.5% needs ore dressing to process；(3) grain size number is thick, carefully uneven, uses conventional beneficiation flowsheet, there is mog
It is difficult to control to.The especially swift and violent increase to iron ore demand nearly ten years, causes rich ore fewer and feweri, lean, thin, miscellaneous and difficult choosing
Current iron ore dressing primary study and the problem solving are become.
Traditional ore dressing Thought is thought, iron ore generally requires and is ground to -0.074mm and accounts for 80% even more thin, makes 95%
Above valuable mineral reaches monomer dissociation, could obtain high-grade iron ore concentrate.Lift iron ore concentrate quality it is necessary to pass through to improve
Mog is realizing.Under traditional ore dressing theory, generally mog is weighed as standard using the percentage composition of -0.074mm,
This becomes " professional etiquette " in Mineral Processing Industry substantially.Existing ore dressing analysis and research process adopts grading more, but to each grain
Level analysing content be limited only to the contents such as the yield of grade, Metal Distribution rate and each grade, but ignore some crucial because
The analysis of element.To lean, thin, matrix process in beneficiation research with production, mainly sort to equipment enlarging and fine fraction
Technique direction deeply, is pursued finely ground ore simply, makes valuable mineral be fully achieved monomer dissociation, without considering mog
Control problem.Therefore, ore dressing often assumes the ore milling product level of " being small at both ends and big in the middle " and joins.Ore Minerals crystalline particle size
There is larger difference, if improving constantly mog, making more mineral grains realize monomer dissociation, part ore deposit certainly will be caused
Thing crystalline particle produces " overground " phenomenon, and " overground " can cause the secondary pollution of crystallizable mineral body；But do not improve mog,
Part crystallizable mineral granule can be made again not yet to realize " dissociation ", and can not effectively be sorted, be likely to result in concentrate grade and decline,
Or make this part mineral with tailings discharging, cause recovery rate in ore-dressing to reduce and the wasting of resources.
Ore grinding time lengthening can be made, one is the increase that can cause energy consumption, thus increasing ore dressing while improving mog
Cost；Two is that the disposal ability that can cause ball mill reduces, and leads to concentrate yield to decline；Three is because part crystallizable mineral granule goes out
Existing " overground ", causes crystallizable mineral body to be contaminated, and leads to concentrate grade to be difficult to improve.
Content of the invention
The various problems existing for prior art, the present invention provides a kind of chromium depleted zone choosing that can reduce mog
Ore deposit method, the present invention is applied to the mineral processing production of chromium depleted zone stone, can select and meet while reducing iron ore grinding fineness
The concentrate product requiring.The technical scheme is that
A kind of chromium depleted zone beneficiation method that can reduce mog, comprises the following steps that:
(1) the chromium depleted zone stone after will be broken is finely ground to granularity -0.074mm and accounts for more than 35%, carries out coarse fraction one-level magnetic
Choosing, magnet separator magnetic field intensity is 180～250ka/m, obtains coarse fraction one-level magnetic concentrate, throws and removes coarse fraction one-level magnetic separation tail
Ore deposit；
(2) coarse fraction one-level magnetic concentrate is classified using high frequency fine screen, screen size is 0.10mm～0.20mm,
Separate oversize and undersize；
(3) high frequency oversize is carried out secondary grinding, after mill, carry out coarse fraction secondary magnetic separation, magnet separator magnetic field intensity again
For 120～160ka/m, obtain coarse fraction secondary magnetic separation concentrate, throw and remove coarse fraction secondary magnetic separation mine tailing；
(4) high frequency fine screen that coarse fraction secondary magnetic separation concentrate is returned to step (2) re-starts classification, and repeat step
(2) operation of～(6)；
(5) high frequency undersize is carried out fine fraction magnetic separation, magnet separator magnetic field intensity is 80～120ka/m, obtains particulate
Level magnetic concentrate, throws and removes fine fraction magnetic tailing；
(6) fine fraction magnetic concentrate is adopted column magnetic separator selected, obtain final iron ore concentrate, column magnetic separator mine tailing is back to step
(3) secondary grinding operation, and repeat step (3), the operation of (4).
In described chromium depleted zone stone, the percentage composition of ferrum is 20～50%.
Described final iron ore concentrate granularity -0.074mm accounts for 35～88%, grade be 65～69%, iron recovery be 45～
97%.
The having the beneficial effect that of the inventive method:
1st, present invention process strong adaptability, can be widely used in the thick, magnetic of the various chromium depleted zone stones of the embedding cloth of fine fraction
Select technological process, the iron ore concentrate -0.074mm content that the more conventional mineral processing production flow process of iron ore concentrate -0.074mm content obtaining obtains
More than 10% can be reduced.
2nd, Beneficiation flowsheet of the present invention is short, can cancel the classifying equipoments such as spiral classifier, cyclone, the letter relatively of equipment arrangement
Single；And decrease circulation in beneficiation flowsheet for the ore pulp, pulp conveying amount reduces, advantageously reduce equipment investment and reduce choosing
Ore deposit production cost.
3rd, the present invention can select qualified concentrate containing in advance to the valuable mineral having been carried out monomer dissociation, it is to avoid this part
Mineral are polluted by " overground " in cyclic process, can improve concentrate quality；And because primary grinding granularity is put slightly, two-stage nitration
Ore grinding, to the oversize that ore deposit is thick magnetic concentrate after classification, has screened out qualified fine fraction product, so can
Significantly lifting one, two-stage nitration ball mill production capacity.
4th, the iron concentrate grade that present invention process is selected is 65～69%, and iron recovery is 45～97%, higher than thin on an equal basis
Using conventional beneficiation method, same species iron ore is carried out under degree beneficiating condition with the technical-economic index of ore dressing.
Brief description
Fig. 1 is the process chart of the chromium depleted zone beneficiation method that can reduce mog of the present invention；
Fig. 2 is process chart and the Specifications of embodiments of the invention 1；
Fig. 3 is the chromium depleted zone stone same using embodiment 1, and grade to be selected is more than the conventional lean magnetic of 65% iron ore concentrate
The process chart of iron ore dressing method and Specifications；
Fig. 4 is process chart and the Specifications of embodiments of the invention 2.
Specific embodiment
The chromium depleted zone stone that Example 1 and Example 2 of the present invention is selected derives from the different ferrum in Liaoning Province Benxi two
The iron ore main chemical compositions in ore deposit ore dressing plant, wherein embodiment 1 are as shown in table 1, the chemical and physical phase of ferrum such as table 2 institute in iron ore
Show；As shown in table 4, in iron ore, the chemical and physical phase of ferrum is as shown in table 5 for the iron ore main chemical compositions of embodiment 2.
The main chemical compositions (%) of the chromium depleted zone stone of table 1 embodiment 1
The chemical and physical phase (%) of ferrum in the chromium depleted zone stone of table 2 embodiment 1
During from table 2 chromium depleted zone stone, the chemical and physical phase of ferrum can be seen that due to silicate, iron content accounts for ferrum element and always contains
The 44.85% of amount, and this part iron mineral belongs to not recyclable mineral in ferrum ore dressing process, so the iron ore of the present embodiment
The less iron ore of other silicates relatively, iron recovery is relatively low.
Magnetic iron ore valuable mineral disseminated grain size (%) of table 3 embodiment 1
The disseminated grain size statistical result showed of table 3, in Ore, magnetic iron ore has the feature of uneven fine grain teeth cloth.For ensureing
More than 90% magnetic iron ore obtains dissociation, according to mill conventional stage, stage concentration flow, need when processing local area Ore to select-
The mog that 0.037mm part accounts for 95% about is more suitable.
The main chemical compositions (%) of the chromium depleted zone stone of table 4 embodiment 2
The chemical and physical phase (%) of ferrum in the chromium depleted zone stone of table 5 embodiment 2
Magnetic iron ore valuable mineral disseminated grain size (%) of table 6 embodiment 2
Embodiment 1
(1) the chromium depleted zone stone after will be broken is finely ground to granularity -0.074mm and accounts for 37.60%, carries out coarse fraction one-level magnetic
Choosing, magnet separator magnetic field intensity is 180ka/m, obtains coarse fraction one-level magnetic concentrate, and grade is 25.04%, and yield is
68.42%, throw and remove coarse fraction one-level magnetic tailing；
(2) coarse fraction one-level magnetic concentrate is classified using high frequency fine screen, screen size is 0.12mm, separates on sieve
Product and undersize；
(3) high frequency oversize is carried out secondary grinding, after mill, carry out coarse fraction secondary magnetic separation, magnet separator magnetic field intensity again
For 120ka/m, obtain coarse fraction secondary magnetic separation concentrate, grade is 33.25%, yield is 35.33%, throws and removes two grades of magnetic of coarse fraction
Select mine tailing；
(4) high frequency fine screen that coarse fraction secondary magnetic separation concentrate is returned to step (2) re-starts classification, and after repeating
Operation；
(5) high frequency undersize is carried out fine fraction magnetic separation, magnet separator magnetic field intensity is 80ka/m, obtains fine fraction magnetic separation
Concentrate 3, grade is 46.82%, and yield is 28.63%, throws and removes fine fraction magnetic tailing；
(6) fine fraction magnetic concentrate is adopted column magnetic separator selected, obtain final iron ore concentrate, column magnetic separator mine tailing is back to step
(3) secondary grinding operation, and the operation after repeating.
The final iron ore concentrate fineness obtaining of the present embodiment accounts for 87.90% in -0.074mm, and grade is 65.14%, and ferrum reclaims
Rate is 46.75%.And the Mineral processing method of iron ores of the higher removal ore deposit fineness of routine, only when three sections of grinding particle sizes account for for -0.037mm
When 89.79%, just can produce the concentrate that grade is more than 65%.
Embodiment 2
(1) the chromium depleted zone stone after will be broken is finely ground to granularity -0.074mm and accounts for 35.60%, carries out coarse fraction one-level magnetic
Choosing, magnet separator magnetic field intensity is 200ka/m, obtains coarse fraction one-level magnetic concentrate, and grade is 38.24%, and yield is
79.32%, throw and remove coarse fraction one-level magnetic tailing；
(2) coarse fraction one-level magnetic concentrate is classified using high frequency fine screen, screen size is 0.15mm, separates on sieve
Product and undersize；
(3) high frequency oversize is carried out secondary grinding, after mill, carry out coarse fraction secondary magnetic separation, magnet separator magnetic field intensity again
For 160ka/m, obtain coarse fraction secondary magnetic separation concentrate, grade is 46.15%, yield is 51.57%, throws and removes two grades of magnetic of coarse fraction
Select mine tailing 2；
(4) high frequency fine screen that coarse fraction secondary magnetic separation concentrate is returned to step (2) re-starts classification, and after repeating
Operation；
(5) high frequency undersize is carried out fine fraction magnetic separation, magnet separator magnetic field intensity is 120ka/m, obtains fine fraction magnetic
Concentrate selection, grade is 59.05%, and yield is 75.85%, throws and removes fine fraction magnetic tailing；
(6) fine fraction magnetic concentrate is adopted column magnetic separator selected, obtain final iron ore concentrate, column magnetic separator mine tailing is back to step
(3) secondary grinding operation, and the operation after repeating.
The final iron ore concentrate fineness -0.074mm obtaining of the present embodiment accounts for 52.57%, and grade is 68.84%, iron recovery
For 96.15%.And by the chromium depleted zone stone of the present embodiment using conventional beneficiation method, iron ore concentrate fineness -0.074mm accounts for
88.46%, grade is 65.70%, iron recovery 90.22%.
Claims (3)
1. a kind of chromium depleted zone beneficiation method that can reduce mog is it is characterised in that comprise the following steps that:
(1) the chromium depleted zone stone after will be broken is finely ground to granularity -0.074mm and accounts for more than 35%, carries out coarse fraction one-level magnetic separation, magnetic
Select machine magnetic field intensity to be 180～250ka/m, obtain coarse fraction one-level magnetic concentrate, throw and remove coarse fraction one-level magnetic tailing；
(2) coarse fraction one-level magnetic concentrate is classified using high frequency fine screen, screen size is 0.10mm～0.20mm, separates
Oversize and undersize；
(3) high frequency oversize is carried out secondary grinding, after mill, carry out coarse fraction secondary magnetic separation again, magnet separator magnetic field intensity is
120～160ka/m, obtains coarse fraction secondary magnetic separation concentrate, throws and removes coarse fraction secondary magnetic separation mine tailing；
(4) high frequency fine screen that coarse fraction secondary magnetic separation concentrate is returned to step (2) re-starts classification, and repeat step (2)
The operation of～(6)；
(5) high frequency undersize is carried out fine fraction magnetic separation, magnet separator magnetic field intensity is 80～120ka/m, obtains fine fraction magnetic
Concentrate selection, throws and removes fine fraction magnetic tailing；
(6) fine fraction magnetic concentrate is adopted column magnetic separator selected, obtain final iron ore concentrate, column magnetic separator mine tailing is back to step (3)
Secondary grinding operation, and repeat step (3), the operation of (4).
2. a kind of chromium depleted zone beneficiation method that can reduce mog according to claim 1 is it is characterised in that institute
The percentage composition stating ferrum in chromium depleted zone stone is 20～50%.
3. a kind of chromium depleted zone beneficiation method that can reduce mog according to claim 1 is it is characterised in that institute
State final iron ore concentrate granularity -0.074mm mesh and account for 35～88%, grade is 65～69%, iron recovery is 45～97%.
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| CN104984821B (en) * | 2015-07-15 | 2017-03-01 | 昆明理工大学 | A kind of beneficiation method separating weakly magnetic mineral and Muscovitum |
| CN107350157B (en) * | 2017-07-27 | 2019-08-06 | 中钢集团马鞍山矿山研究院有限公司 | A kind of stage grinding of microfine low-grade magnetite, stage grading new method |
| CN109482338A (en) * | 2018-12-21 | 2019-03-19 | 马钢集团矿业有限公司 | A kind of beneficiation method of the narrow gradation of magnetic iron ore, the independent ore grinding of chats |
| CN109879293A (en) * | 2019-03-26 | 2019-06-14 | 昆明理工大学 | A kind of method of microfine high-silicon iron ore desiliconization coproduction potassium silicate |
| CN110038717A (en) * | 2019-03-29 | 2019-07-23 | 中冶北方（大连）工程技术有限公司 | Vanadium titano-magnetite spoil reclaming technique |
| CN110523504A (en) * | 2019-08-21 | 2019-12-03 | 安徽金安矿业有限公司 | A kind of secondary grinding method of closed cycle |
| CN112295722A (en) * | 2020-08-18 | 2021-02-02 | 安徽金安矿业有限公司 | Differentiated production method of high-quality magnetite concentrate |
| CN113019681A (en) * | 2021-03-22 | 2021-06-25 | 中冶北方（大连）工程技术有限公司 | Grinding and selecting process for producing pellet raw material iron fine powder |
| CN113457834A (en) * | 2021-06-30 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | Mineral processing technology for recovering high-grade iron ore concentrate from copper tailings |
| CN113953068B (en) * | 2021-10-25 | 2023-03-31 | 中国铝业股份有限公司 | Method for removing impurities and improving quality of gibbsite type high-iron bauxite in original place |
| CN114130531B (en) * | 2021-12-09 | 2024-01-30 | 太原钢铁(集团)有限公司 | Method for improving utilization coefficient of primary ball mill of grinding and selecting process |
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| CN101219413B (en) * | 2008-01-22 | 2013-04-10 | 福州昌晖自动化系统有限公司 | Technique for manufacturing hyperpure iron extract |
| CN102441481B (en) * | 2011-09-19 | 2013-08-07 | 鞍钢集团矿业公司 | Mineral separation process for magnetic hematite rough concentrates |
| CN102698871B (en) * | 2012-06-17 | 2014-11-05 | 鞍钢集团矿业公司 | Ore dressing technology for treating vanadium titano-magnetite |
| CN103041920B (en) * | 2012-12-19 | 2016-07-20 | 太原钢铁(集团)有限公司 | A kind of beneficiation method being suitable for chromium depleted zone and ore-sorting system |
| CN103272684B (en) * | 2013-06-13 | 2014-11-05 | 鞍钢集团矿业公司 | Hematite stage grinding and magnetic-separation-flotation process |
| CN104324798A (en) * | 2014-08-29 | 2015-02-04 | 攀钢集团矿业有限公司 | Ore dressing method for magnetic ores |
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Effective date of registration: 20171206 Address after: 113100 Fushun County, Liaoning Province, post anoxi Village Patentee after: Fushun Hanking aoniu mining Limited by Share Ltd Address before: 114051 No. 185 Qianshan Middle Road, hi tech Zone, Liaoning, Anshan Patentee before: Duan Fengmei |